Direct bucket drive



Dec. 16,- 1930.

E. H. LICHTENBERG 1,785,031

DIRECT BUCKET DRIVE Filed Feb. 12, 1930 2 Sheets-Sheet l Ema/whom [I hi lie/2 terzfiefy.

Dec. 16, 1930. E. H. LICHTENBERG DIRECT BUCKET DRIVE Filed Feb. l2, 1930 2 Sheets-Sheet 2 Eh. .Zich tenbetg- Patented Dec. 16,1930

UNITED, STATES, PATENT orrlcs E-RICH f-H. LICHTENBERG, .OF MILWAUKEE, WISCONSIN, ASSIGNO'R TO KOEI-IRING COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORATION 1 DIRECT BUCKET DRIVE Application filed February 12, 1930; serial No. 427,908.

' This invention is primarily associated with machinesknown as pavers, of the. type employing-a boom and bucket for distribution of concrete aggregates over subgrades to be 5 paved, although it may -.find utility in its application to machines of this general type wherein any device other than a bucket is moved along a boom in its operation. In machines of the type mentioned, it is highly 1'0 desirable to dispose the operating instrumentalities-in' as compact a space as possible, consistent with eflicient operation. It is, moreover, desirable to protect said instrumentalities by locating the same-within the framework of the machine. It is still further 'desider atum to providemeans Whereby said-"operatinginstrumentalitics may be appliedas a unit to and removed from operating position in relation to the framework,

thereby greatly facilitating assembly and disassembly for repairand other purposes.

In constructions heretofore in vogue, it has been common to employ a cable drum actuated by operating instrumentalities, said drum having its axis-at right angles to'thelength of the pavert- In providing for'such a dis-position of thedrum heretofore it has been necessary to use rather complicated gearing and; clutch devices to make possible the actuation 8(1 of the drum when in the position mentioned and the cable for driving'or traversing the bucket has been disposed in a position unfavorable-to'convenient and ready training of the same along the boom. In fact, special ing drum. located; in the ,machine 7 framework, 111 1 1.118 1nstance,;the m xing drum, as heretofore. -;Theoasing; is formed for; expedient guiding sheaves-and mountings have hadto be shafting, control clutches andthe like, ina'. single casing, provision being made. for actu-. ation of this mechanism from a icorrespond-j bodily attachment to'and removal from the interiorof the framework. The'slhafting is arranged substantially parallel to the mixing drum and the bucket operating cable drum is'mounted on said shafting in a direct manner. It is thus apparent that the axis of the drummember is substantially parallel-to that of the mixing drum, which latter is in turn mounted'on an aXis substantially parallel with the length of the paver, all of which enables 00 me to obtain; an eflicient simplified cable trainingarrangement between the drum and the boom that carries the bucket to whichthe cable is attached.

rFor'a full and more complete understanding ofmy invention, referencema'y be had to the following description and accompanying drawings, in which I Figure 1 is a'fragmentary elevational viewof a paving machine embodying my inven fm tion, certain parts beingshown in perspective.

Figure 2 is a fragmentary longitudinal sectional view-of certain of the features embodied in my invention, certain parts being shown in elevation. 1

- FigureB is a fragmentary transverse View taken approximately in the plane indicated by the line3-3 of Figure 2, certain parts being shown-in section to illustrate the manner of attachment of the operating instrumentalities housing to the framework.

Figure 4 is a fragmentary'elevational View illustrating the operating instrumentalities providing for'movement of the bucket along the boom and swinging of the boom, all of saidin'strumentalities being housed in the casing illustrated in Figure 2.

While a preferred specific embodiment of my invention is herein set forth, it is to be understood that I am not to be limited to the exact constructions illustrated and described, because various modifications of these details may be provided in putting theinvention into practice within the purview of the appended claims. 7

Reference character A indicatesgenera-lly a paving machine embodying a boom .13, a bucket C, cable means D for causing vertical movement of the boom, and instrumental-ities E providing for movement of the boom B in a horizontal plane. The framework 1 of the paver includes forward spaced beams 2 which extend from the upper forward part of the frame diagonally rearwardly to the base or .lioor of the machine A. Plates 2a are secured to the upper portions of the spaced beams 2, both within and without the frame 1, said plates being provided with openings 2?) for the reception and removal of the forward portion of the casing 1. Supported by the ceiling 3 of the framework 1 is a casing 1 inch contains shafting, gears, clutches, rake means, and the like indicated generally t 5. this mechanism providing for swing of the boom in a horizontal plane and for the movements of the bucket C along the boom B. The casing 4 is provided with perforated flanges 6, and bolts and the like 7 pass through said flanges and through said ceiling 3 to hold said casing fixed to said ceiling. A portion of the ceilin directly over certain of the shafting and the like above mentioned, is open and a cover 8 is removably applied over the opening 9. The purpose of said opening is to provide access to said instrumentalities without the necessity of removing the casing t entirely from the framework. The casing is provided with a forward shaft enclosing portion 10 which. houses the greater portion of the shaft 11. The portion 10 of the casing is provided with a bolt 12 by which it is maintained in supported position relative to the upper end of the framework 1 where it meets the upper portion of one of the beams 2. A cable drum 13 is keyed at 14 to the outer end of the shaft 11 for rotation therewith. Suitable means, not shown, is of course provided for actuating said shafting and the like to produce the desired movements of the bucket and the boom. A gear 15 is keyed to the drive shaft 16 of the operating mechanism, and said gear is in mesh with the gear 17 which forms part of the mixing drum 18. Power for swinging the boom in a horizontal plane is obtained by virtue of the gear 19 on the vertical shaft 20 meshing with the gear 21 on the shaft 11. Said shaft 20 operates a worm 22 through the means of said bevel gearing, and the swing gear sector 23, which is operated by said worm, controls the swinging movements of the boom B in a horizontal plane about the pivot 24. For the purpose of moving the bucket C along the boom B, as well as actuating the trip mechanism, generally indicated at F, for said bucket. I employ a pair of coaxial sheaves 25. Said sheaves are of course rotatable in opposite directions. The sheave 26 cooperates with the sheaves and the cable drum 13 to provide for movement of the cable 28 in opposite directions. The ends of the cable are secured to a shuttle, not shown, constituting a part of the trip mechanism F.

The sheaves 25 are mounted for movement in a vertical plane about the axis 27 and the lower limits of movement.

cable means D is provided, together with suitable control mechanism for making possible this movement of the boom B.

For the purpose of preventing undue tensioning and slacking of the cable 28, which trained about the cable drum 13 and sheaves 25 and 26, l locate the sheaves 25 so that the plane of the portion 29 of the cable disposed between the sheaves 25 and the cable drum 13 shall contain the pivot axis 27 when the boom is substantially intermediate its upper and To this end, the sheaves 25 are located as illustrated in Figure 1, wherein the cable receiving groove portions of said sheaves, which are located at the extreme right, are tangent to the plane containing the pivot axis 27 and the upwardly extending portion 29v of the cable 28. I moreover locate the sheaves 25 as close to the pivot 27 as is feasible. It will therefore be apparent that the extent of movement of the plane of the portion 29 of the cable 28 to the right of the pivot 27 as viewed in Figure 1, due to the movement of the boom B to its uppermost position, will be very slight and not sufficient to brake the cable. It will also be apparent that the extent of movement of said portion of the cable to the left of the pivot 27 due to the movement of the boom B to its lowermost position will occasion a slight slacking of said cable, which slacking is insuflicient to prevent efficient operation of the cable.

It is evident from the foregoing that I have provided for a most efficient location of the operating instrumentalities providing for actuation of the bucket and the trip therefor as well as the swinging movement of the boom. It will easily be seen from What has transpired thus far that the operation of removal of the instrumentalities 5 in the casing 41: from the frame 1 is one involving a minimum of time and labor. It will further be appreciated from the foregoing that a considerable amount of mechanism has been done away with in the location of the axis of the drum 13 substantially parallel to the length of the paver and mixing drum 18 from which the boom and bucket operating mechanism derives its power. In addition, by locating the cable sheaves 25 as above outlined, it will be apparent that the cable 28 will at all times be operative for the purposes for which it is provided, regardless of the position occupied by the boom B.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States, is

1. In a paving machine of the class de scribed for distributing concrete aggregates upon a subgrade, in combination, a supporting frame, a boom associated with said frame, pivotal connections intermediate one end of the boom and the frame enabling horizontal and vertical swinging movements of the boom, a bucket to traverse the boom, cable means connected with the bucket to move it in and out on the boom, and an operating unit for said cable means carried by the upper portion of the framework and comprising drive shafting, devices to put said shafting in motion and a cable drum carried by the shafting in a position projecting from the framework so that the drum is arranged above the vertical axis of the boom with the cable means passing therearound in a plane substantially including the said axis, with attaching devices for said unit enabling its bodily re moval from the frame.

2. In a paving machine of the class de scribed for distributing concrete aggregates upon a subgrade, in combination, a supporting frame, a boom associated with said frame, pivotal connections intermediate one end of the boom and the frame enabling horizontal and vertical swinging movements of the boom, a bucket to traverse the boom, cable means connected with therbucket to move it in andout on the boom, and an operating unit for said cabler'means carried by the upper portion of the framework and comprising drive shafting, devices to put said shafting in motion, and a cable drum carried by the shafting in a position proj ecting from the framework so that the drum is arranged above the vertical axis of the boom with the cable means passing therearound in plane substantially including the said axis, with attaching devices for said unit enabling its bodily removalfrom the frame, the boom being provided with guiding sheaves for the cable, said sheaves located at the outer end i of the boom and at the inner end of the boom,

those at the inner end of the boom being disposed upon a horizontalaxis to bring peripheral portions of these sheaves in substantial alignment with a plane including the horizontal and vertical axes of the boom itself.

3. In a paving machine of the class de-- scribed for distributing concrete aggregates upon a subgrade, in combination, a supporting frame, a boom associated with said frame, pivotal connections intermediate one end of the boom and the frame'enabling horizontal and vertical swinging movements of the boom, a bucket to traverse the boom, cable means connected with the bucket to move it in and out on the boom, an operating unit carried by the upper portion of the frame and comprising a casing, shafting mounted upon the casing and arranged longitudinally nected with the bucket passing upwardly from the inner end portion of the boom to said drum and aroundthe drum to be driven by the latter, guiding sheaves carried by the inner end portion of the boom adjacent to the vertical and horizontal axis provided at such portion and having the cable means trained therearound and passing directly to said drum, a portion of the cable means between the drum and said guiding sheaves be ing in a plane substantially that including the vertical and horizontal axes of the boom, and means whereby the said unit on the framemay be readily detached to facilitate its bodily removal from the frame.

f. A machine substantially as claimed in claim 3 wherein the means detachably supporting the said unit is carried by the ceiling portion of the frame, and a detachable top plate carried by said ceiling portion of the frame removable in order to give access to the parts of the shafting and operating devices thereon which are located within the confines of the frame. V

In testimony whereof I afiix my signature.

ERIOH H. LIGHTENBERG.

of the machine and parallel to the boom so i that a portion of said shafting projects a short distance from the frame at the boom end thereof and at a point above the inner end of the boom, the said unit comprising likewise a drum carried by said shafting at its outer projecting end portion which drum is disposed on an axis parallel with the length dimension of the boom, the cable means-con- 

